Cooling absorption tower, CO2 recovery device including same, and CO2 recovery method

Abstract

A cooling absorption tower for a CO 2 recovery device, comprises: an outer shell; a cooling section for cooling a flue gas, the cooling section being disposed in the outer shell; and an absorbing section configured to cause CO 2 in the flue gas cooled by the cooling section to be absorbed in an absorption solvent, the absorbing section being disposed in the outer shell and above the cooling section.

The invention claimed is: 
     
       1. A CO 2  recovery device, comprising a cooling absorption tower including:
 an outer shell; 
 a cooling section for cooling a flue gas, the cooling section being disposed in the outer shell; and 
 an absorbing section configured to cause CO 2  in the flue gas cooled by the cooling section to be absorbed in an absorption solvent, the absorbing section being disposed in the outer shell and above the cooling section, 
 wherein the absorbing section includes a chimney tray for storing the absorption solvent which has absorbed CO 2  in the flue gas, the chimney tray being disposed at a lowest portion of the absorbing section, 
 wherein the CO 2  recovery device further comprises: 
 an absorption solvent tank disposed below the absorbing section; and 
 a tank introduction line for introducing the absorption solvent stored in the chimney tray to the absorption solvent tank. 
 
     
     
       2. The CO 2  recovery device according to  claim 1 ,
 wherein an inner diameter of the outer shell at the cooling section is larger than an inner diameter of the outer shell at the absorbing section. 
 
     
     
       3. The CO 2  recovery device according to  claim 1 ,
 wherein the tank introduction line extends to the absorption solvent tank without passing through underground. 
 
     
     
       4. The CO 2  recovery device according to  claim 1 ,
 wherein the tank introduction line includes an overflow line connected to the chimney tray within a height range of an upper half of a riser of the chimney tray. 
 
     
     
       5. The CO 2  recovery device according to  claim 4 , comprising:
 a valve disposed in the overflow line; and 
 a blower for feeding a flue gas to the cooling absorption tower, 
 wherein the valve is configured to be opened based on a signal indicating that the blower is stopped. 
 
     
     
       6. The CO 2  recovery device according to  claim 1 , comprising:
 a regeneration tower for regenerating the absorption solvent from the absorbing section; 
 a regeneration tower introduction line for extracting the absorption solvent from the chimney tray and introducing the absorption solvent to the regeneration tower; and 
 a branch line branching from the regeneration tower introduction line and connected to the absorption solvent tank, 
 wherein the tank introduction line includes the branch line and a portion of the regeneration tower introduction line upstream of a branch position of the branch line. 
 
     
     
       7. The CO 2  recovery device according to  claim 6 , further comprising an absorption solvent pump for pumping the absorption solvent to the regeneration tower, the absorption solvent pump being disposed in a portion of the regeneration tower introduction line downstream of the branch position. 
     
     
       8. A CO 2  recovery method, comprising:
 a step of cooling a flue gas by a cooling section disposed in an outer shell; 
 a step of feeding the flue gas cooled by the cooling section to an absorbing section disposed in the outer shell and above the cooling section; 
 a step of causing CO 2  in the flue gas to be absorbed in an absorption solvent by the absorbing section; 
 a step of storing the absorption solvent which has absorbed CO 2  in the flue gas by the absorbing section in a chimney tray disposed at a lowest portion of the absorbing section; and 
 a step of introducing the absorption solvent stored in the chimney tray to an absorption solvent tank disposed below the absorbing section via a tank introduction line. 
 
     
     
       9. The CO 2  recovery method according to  claim 8 , comprising:
 a step of feeding a flue gas to the cooling section by using a blower, 
 wherein the cooling step includes cooling the flue gas fed by the blower, and 
 wherein the step of introducing to the absorption solvent tank includes, when the blower is stopped, opening a valve disposed in the tank introduction line to introduce the absorption solvent to the absorption solvent tank.